Process and apparatus for molding- twyers and the like



B. F. CAFFEY. PROCESS AND APPARATUS FOR MOLDING TWYERS AND THE LIKE.

APPLICATION FILED JAN.2 918.

Patented Nov. 4, 1919.

1,3%1,0&

(jvwamtoz v difliculty lies in the proper BENJAMIN F. CAFFEY, 0F BIRMINGHAM, ALABAMA.

PROCESS AND APPARATUS FORMOLDING- TWYERS AND THE LIKE.

Specification of Letters Patent.

Ifatented N (W. 4, 1919.

Application filed January 2, 1918. Serial no, 210,069.

To all whom it may concern:

Be it known that I, BENJAMIN FRANKLIN CAFFEY, a citizen of the United States of America, residing at Birmingham, in the county of Jefferson and State of Alabama, have invented certain new and useful Improvements in Processes and Apparatus for Molding Twyers and the like, of which the following is a specification.

My invention relates to a process and apparatus for the molding of blast furnace twyers and like castings.

In the present practice, blast furnace twyers are molded in the ordinary cope and drag, the cores being supported on chaplets set into the drag. This practice permits the metal when poured to shift the cores either by its fluid pressure or by first melting the chaplets and floating the core. The extreme fastening of the cores and the maintenance of their accurate alincnient when placed in the mold. Neglect of either the fastening or alinement produces a twyer with a wall of varying thickness, the thinner part of whichis sure -to fail under operation in the furnace. The

when cast is difficult to inspect audits life in operation is problematic, dependlng largely upon the uniformity of its wall thickness. copper, is a considerable loss but the time lost in the operation of the furnace caused by the failure of a twyer is far more lin portant, and it is apparant that the production of more reliable twyers is a cons derable factor in blast furnace operation.

The principal object of my invention 1s to provide a process by which a perfect mold can be produced to the end that the castmgs will be uniform. Q

A further object of my invent on IS tO devise a simple apparatus by means of which this process can be carried out.

twyer It is understood that changes in the form of the twyer and modifications in the apparatus necessitated thereby are within the scope of the invention and the example illustrated and described is only one speclfic embodiment thereof.

In the drawings a Figure 1 shows in quarter section the core support ring with the supporting and venting tubes fastened therein. d Fig. 2 is a similar view to Fig. 1, but

The wastage of metal, generally tubes 7- to the like is inserted.

shows the center plug in position, core clay packed in the support ring and the pipe thimbles in position.

Fig. 3 shows the thickness ring in position and the black sand in position between the center plug and thickness ring.

Fig. 4 shows the thickness ring removed and the core box in position and the core clay rammed therein.

Fig. shows the completed baked core after the black sand has been removed.

Fig. 6 is a sectional view of the mold.

Fig. is a sectional view of the mold and the core inverted and inserted therein.

Fig. 8 shows the twyer completed in quarter section.

Fig. 9 is a detail view of a short pipe section in which the core of a cooling pipe hole is formed.

Similar reference numerals refer to similar'parts throughout the drawings.

To support and aline the core in the mold I provide an annular ring 1, which has substantially parallel horizontal faces 2 and 3, outer and inner beveled edges a and 5, respectively, and a dovetailed groove 6 formed in the face 3. At intervals, preferably at 90 positions, a number of venting and core supporting tubes 7 are fastened into position at an angle to the face 3 of the ring 1. This ring 1 is first laid fiat upon its face 2 and the dove-tailed groove is next filled level with clay to form a core band 8, after which short pipe sections 9 of a proper diameter are passed over the vent position 011 the core clay band 8 whereupon when each section 9 is substanally concentric with its respective tube 7, it is filled with core clay to form the cores 10 for the cooling pipe holes. The ring 1 is then lifted and passed over a center plug 11 the plug being tapered to engage and be ceiitered by the beveled edge 5. A thickness ring 12 is lowered to position, as shown in Fig. 3, its beveled inwardly facing edge 12 thereof engaging and being centered by the outer beveled edge 4 of the ring 1. The upper face of this thickness ring, when 'in position stands level with the top of the pipe sections 9. Around the pipe sections 9 and between the center plug 11 and the ring 12 a band 13 of black foundry sand or This is leveled with the top of the thickness ring, whereupon the ring is removed leaving the band 13 in position. A core box 1a is then posltioned, as

shown in Fig. 4:, and after sealing the up per end of the vent tubes 7 with either cotton waste 15 or a suitable plug, core clay is rammed to position to form the annular core 16.

In practice, these operations should follow in such rapid succession that the core clay binds throughout to form a solid and integral core out of the cores 8, 10 and 16. The core box 1% and the center plug 11 are now removed and the ring 1, vent pipes 7, pipe sections 9, the black sand band 13 and the cores formed thereon are now placed in the core oven. In the oven the core clay bakes hard and is firmly fastened to the ring and vent pipes, but the black sand band crumbles and upon removal from the oven can be blown off. Fig 5 shows the completed core after baking and removal of the black sand band 13.

lVith this apparatus it is not necessary to use the ordinary cope but a suitable pattern forms the requisite mold 17 in the drag 18. Fig. 7 shows the core illustrated in Fig. 5 inserted and set in position in the mold 17. The outer beveled edge 1 of the ring 1 engages and is centered by the ta-- cred edge 19 formed by the pattern in-the mold but the weight of the core is supported by a horizontal annular seat 21 formed in the mold upon which the face 8 of the ring 1 rests. To core the central opening of the twyer, a suitable core 20 is provided by any ordinary method. is supported in the core print 21 formed in the mold and at its upper edge is provided with an annular shoulder 25 havinga tapered edge 22 which engages and is centered by the inner beveled edge 5 of the ring 1. The gate 23 is shown formed in this central core but any method of gating may be used. The pipes or tub-es 7 are perforated to permit a venting of the core. The pouring of the mold after it'is thus closed, is conducted in the manner well understood in this art and the finished twyer 26 is shown in Fig. 8. It will be noted that the rings 9 become incorporated or cast-jointed in the finished casting. which the cooling pipes must be threaded and as they are disposed at an incline to the horizontal it is diflicult to cut the threads in them. I therefore prefer to thread the pipe from which the sections are out before sawing them off, the pipe being held at an angle to the saws when being cut correspondingly to the inclination of the pipes 7 to the ring 1. The pipe sections 9 as thus threaded and out are shown in Fig. 9 and may be of any suitable metal, preferably iron to afi'ord threads which will last the full. life of the twyer.-

This central core These rings form-the holes into- The ring patterns .9 may be formed of any suitable material such as asbestos or the like should it be desired not to use the metallic pipe ring patterns.

While it may be possible to dispense with the core clay band 8 in the centering ring 1 I prefer to use the same rather than to cast the outer end face of the twyer against the chill.

What I claim as new and desire to secure by Letters Patent, is

1. The hereindescribed process for molding twyers and like articles, which consists in forming a core band on a centering ring, mounting ring patterns on the core band, forming water hole cores in said rings, forming a sand ring above the core band and about said hole cores, forming the water jacket core on the sand ring and on the hole cores, baking the cores, removing the sand ring, providing a dragwith a bottom print, inverting the baked core and mounting it by its centering ring in said drag, and introducing a center core which is seated in said drag print and centered by said centering ring, substantially as described.

The hereindescribed process for molding t-wyers, which consists in forming a main jacket core having an intermediate sand section corresponding to the end of the twyer which carries the water pipe holes and which sand section surrounds the water hole cores, removing said sand section after baking the core, seating the baked jacket core in a sand mold, and centering a center core in the mold andjacket core.

3. A core for twyer molds, comprising a ring plate carrying an annular core, core vent pipes connected to said plate and projecting through said core, rings surrounding and spaced from said pipes, water hole cores formed in said rings surrounding said pipes, and a water jacket core jointed to the said first, mentioned cores and anchored by said pipes, substantially as described.

4. In a core making apparatus, an annular centering core plate carrying core. vent pipes projecting therefrom, and ring patterns surrounding and adapted to be spacedby cores from said pipes, said core plate having its inner and outer edges similarly beveled, as and for the purposes described.

5. The hereindescribed process for forming a core for twyers, which consists in providing an annular centering core plate having inner and outer beveled edges seating said plate about a taper pattern, mounting perforated core vent pipes in said core plate, centering a thickness ring on said ring plate, said ring having an annular center opening spaced from the pattern, placing a concentric water hole pattern about each pipe, filling in said hole patterns With core clay, filling theannular space about said hole patterns between said thickness ring and the main pattern With a sand band, removing the thickness plate, centering a coreboX on said core plate, forming the Water jacket core on said hole patterns and sand band, stripping the core boX and pattern from the core, baking the core, and removing said sand band after the baking operation.

6. A core for forming tWyers comprising a centering ring, a Water jacket core, a ring covering core, cylindrical Water hole cores connecting said covering and Water jacket. cores and disposed at an acute angle to the plane of the core ring, said cylindrical cores being formed in patterns made of sections of pipe which remain a part of the core and Copies of this patent may be obtained for five cents each, by addressing become cast-jointed in tially as described.

7. A core for forming tWyers comprising a centering ring, a Water jacket core, a ring covering core, cylindrical Water hole cores connecting said covering and Water jacket cores and disposed at an acute angle to the plane of the core ring, said cylindrical cores being formed in patterns made of sections of pipe which are internally threaded which remain a part of the core and become castjointed in the casting, substantially as described.

In testimony whereof I afliX my signature.

BENJAMIN F. CAFFEY.

the casting, substanlVitness Norma XVELSH.

the Commissioner of Patents,

Washington, D. G. 

